1,4-Dioxane
South Huntington Water Department
1,4-Dioxane is a solvent classified by the EPA as a likely human carcinogen. It contaminates groundwater in many states due to industrial wastewater discharges, plastic manufacturing runoff and landfill runoff. Read More.
Animal studies show that 1,4-dioxane can target the liver, kidneys and respiratory system, and that prenatal exposure can harm the developing fetus. The State of California has set a Public Heatlh Goal of no more than 1 part per billion of 1,4-dioxane in drinking water. The state of Massachusetts sets a legal limit of 0.3 ppb, and New Hampshire's limit is 3 parts per billion. There is no national drinking water standard for this contaminant.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.0650 ppb | 4 | 1 | ND - 0.260 ppb |
| 2014 | 0.0614 ppb | 7 | 2 | ND - 0.260 ppb |
| 2015 | 0.514 ppb | 7 | 6 | ND - 1.000 ppb |
| 2016 | 0.800 ppb | 1 | 1 | ND - 1.60 ppb |
| 2017 | 0.650 ppb | 1 | 1 | ND - 1.30 ppb |
| 2018 | 0.700 ppb | 1 | 1 | ND - 1.40 ppb |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.35 ppb
The EWG Health Guideline of 0.35 ppb for 1,4-dioxane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2013-11-19 | 90027 | ND |
| 2013-11-19 | 78156 | 0.260 ppb |
| 2013-11-20 | 78142 | ND |
| 2013-11-20 | 78137 | ND |
| 2014-04-15 | 78121 042014 | 0.260 ppb |
| 2014-05-12 | UCMR3 EP016 | ND |
| 2014-05-12 | UCMR3 EP013 | ND |
| 2014-05-12 | UCMR3 EP012 | 0.170 ppb |
| 2014-05-14 | 78137 05/14/2014 | ND |
| 2014-05-14 | UCMR3 EP007 | ND |
| 2014-05-16 | UCMR3 EP015 | ND |
| 2015-01-23 | 78132 012015 | ND |
| 2015-01-23 | 78148 012015 | 1.000 ppb |
| 2015-01-26 | 78152 012015 | 0.1000 ppb |
| 2015-04-23 | 78130 42015 | 0.810 ppb |
| 2015-07-27 | 78148 72015 | 0.940 ppb |
| 2015-07-27 | 78132 72015 | 0.280 ppb |
| 2015-10-21 | 78130 1015 | 0.470 ppb |
| 2016-08-23 | 0.800 ppb | |
| 2017-02-22 | 0.650 ppb | |
| 2018-02-09 | 0.700 ppb |